Lithographic printing plate precursor, and method for producing same

Abstract

Provided is a lithographic printing plate precursor having extremely excellent and excellent on-board developability even after the lithographic printing plate precursor is preserved for a long period of time, and excellent preservation stability, by a lithographic printing plate precursor including, on a support, an image recording layer containing (A) a thermoplastic fine particle polymer, (B) an infrared ray absorbing dye, and (C) a polyglycerol compound, in which the infrared ray absorbing dye is an infrared ray absorbing dye expressed by the Formula (I) as defined herein, and the polyglycerol compound is a compound having three or more structural units selected from structural units expressed by the Formulae (1) and (2) as defined herein.

What is claimed is: 
     
         1 . A lithographic printing plate precursor comprising, on a support:
 an image recording layer containing   (A) a thermoplastic fine particle polymer,   (B) an infrared ray absorbing dye, and   (C) a polyglycerol compound,   wherein the infrared ray absorbing dye is an infrared ray absorbing dye expressed by the following General Formula (I), and   wherein the polyglycerol compound is a compound having three or more structural units selected from structural units expressed by the following General Formulae (1) and (2),   
       
         
           
           
               
               
           
         
         where, in General Formula (I), R 1  represents a group expressed by the following General Formula (Ia), each of R 2  and R 3  independently represents a hydrogen atom or an alkyl group, or R 2  and R 3  represent atomic groups that are required for forming a cyclic structure by being linked to each other, each of Ar 1  and Ar 2  independently represents an atomic group that is required for forming a benzene ring or a naphthalene ring, each of Y 1  and Y 2  independently represents an sulfur atom or a dialkyl methylene group, each of R 4  and R 5  independently represents an alkyl group, each of R 6 , R 7 , R 8 , and R 9  independently represents a hydrogen atom or an alkyl group, and Za represents a counter ion that neutralizes electrical charges,
   —NR 10 -L-X—Y   General Formula (Ia)
 
 
         where, in General Formula (Ia), R 10  represents a hydrogen atom, an aliphatic hydrocarbon group, or a (hetero)aryl group, or an atomic group that is required for forming a cyclic structure by being linked to Y, L represents a single bond or a bivalent linking group, X represents —CO—, —SO 2 —, or —SO—, Y represents —R 11a , —OR 11b , —NR 12 R 13 , or —CF 3 , R 11a  represents a hydrogen atom, an aliphatic hydrocarbon group, or a (hetero)aryl group, R 11b  represents an aliphatic hydrocarbon group or a (hetero)aryl group, each of R 12  and R 13  independently represents a hydrogen atom, an aliphatic hydrocarbon group, or a (hetero)aryl group, or R 12  and R 13  represent atomic groups that are required for forming a cyclic structure by being linked to each other, and 
       
       
         
           
           
               
               
           
         
         where, in General Formulae (1) and (2), A represents a hydrogen atom, an alkyl group having 1 to 4 carbon atoms, or an alkyl carbonyl group having 2 to 5 carbon atoms. 
       
     
     
         2 . The lithographic printing plate precursor according to  claim 1 ,
 wherein A in the structural units expressed by General Formulae (1) and (2) is a hydrogen atom.   
     
     
         3 . The lithographic printing plate precursor according to  claim 1 ,
 wherein, in General Formula (Ia), X is —CO—.   
     
     
         4 . The lithographic printing plate precursor according to  claim 2 ,
 wherein, in General Formula (Ia), X is —CO—.   
     
     
         5 . The lithographic printing plate precursor according to  claim 1 ,
 wherein, in General Formula (Ia), Y is —OR 11b , and said R 11b  is an aliphatic hydrocarbon group with an a position-branched chain shape.   
     
     
         6 . The lithographic printing plate precursor according to  claim 2 ,
 wherein, in General Formula (Ia), Y is —OR 11b , and said R 11b  is an aliphatic hydrocarbon group with an a position-branched chain shape.   
     
     
         7 . The lithographic printing plate precursor according to  claim 3 ,
 wherein, in General Formula (Ia), Y is —OR 11b , and said R 11b  is an aliphatic hydrocarbon group with an a position-branched chain shape.   
     
     
         8 . The lithographic printing plate precursor according to  claim 4 ,
 wherein, in General Formula (Ia), Y is —OR 11b , and said R 11b  is an aliphatic hydrocarbon group with an α position-branched chain shape.   
     
     
         9 . The lithographic printing plate precursor according to  claim 5 ,
 wherein said R 11b  is a tertiary butyl group.   
     
     
         10 . The lithographic printing plate precursor according to  claim 6 ,
 wherein said R 11b  is a tertiary butyl group.   
     
     
         11 . The lithographic printing plate precursor according to  claim 7 ,
 wherein said R 11b  is a tertiary butyl group.   
     
     
         12 . The lithographic printing plate precursor according to  claim 8 ,
 wherein said R 11b  is a tertiary butyl group.   
     
     
         13 . The lithographic printing plate precursor according to  claim 1 , further comprising:
 an interlayer containing a compound having a phosphoric acid group or a phosphonic acid group between the support and the image recording layer.   
     
     
         14 . The lithographic printing plate precursor according to  claim 2 , further comprising:
 an interlayer containing a compound having a phosphoric acid group or a phosphonic acid group between the support and the image recording layer.   
     
     
         15 . The lithographic printing plate precursor according to  claim 13 ,
 wherein the compound having the phosphoric acid group or the phosphonic acid group is a polymer compound.   
     
     
         16 . The lithographic printing plate precursor according to  claim 14 ,
 wherein the compound having the phosphoric acid group or the phosphonic acid group is a polymer compound.   
     
     
         17 . The lithographic printing plate precursor according to  claim 13 ,
 wherein the compound having the phosphoric acid group or the phosphonic acid group is a polymer compound.   
     
     
         18 . The lithographic printing plate precursor according to  claim 14 ,
 wherein the compound having the phosphoric acid group or the phosphonic acid group is a polymer compound.   
     
     
         19 . A method for producing a plate comprising:
 image-exposing the lithographic printing plate precursor according to  claim 1 , with an infrared ray laser; and   removing an unexposed portion of the image recording layer by using at least one of printing ink and dampening water on a printing machine.